DateTimeZone::getOffset

    timezone_offset_get

    (PHP 5 >= 5.2.0, PHP 7, PHP 8)

    DateTimeZone::getOffset -- timezone_offset_get — Returns the timezone offset from GMT

    Descrizione

    Stile orientato agli oggetti

    public DateTimeZone::getOffset(DateTimeInterface $datetime): int

    Stile procedurale

    timezone_offset_get(DateTimeZone $object, DateTimeInterface $datetime): int

    This function returns the offset to GMT for the date/time specified in the datetime parameter. The GMT offset is calculated with the timezone information contained in the DateTimeZone object being used.

    Elenco dei parametri

    oggetto

    Solo per lo stile procedurale: Un oggetto DateTimeZone restituito da timezone_open()

    datetime

    DateTime that contains the date/time to compute the offset from.

    Valori restituiti

    Returns time zone offset in seconds.

    Esempi

    Example #1 DateTimeZone::getOffset() examples

    <?php
    // Create two timezone objects, one for Taipei (Taiwan) and one for
    // Tokyo (Japan)
    $dateTimeZoneTaipei = new DateTimeZone("Asia/Taipei");
    $dateTimeZoneJapan = new DateTimeZone("Asia/Tokyo");

    // Create two DateTime objects that will contain the same Unix timestamp, but
    // have different timezones attached to them.
    $dateTimeTaipei = new DateTime("now", $dateTimeZoneTaipei);
    $dateTimeJapan = new DateTime("now", $dateTimeZoneJapan);

    // Calculate the GMT offset for the date/time contained in the $dateTimeTaipei
    // object, but using the timezone rules as defined for Tokyo
    // ($dateTimeZoneJapan).
    $timeOffset = $dateTimeZoneJapan->getOffset($dateTimeTaipei);

    // Should show int(32400) (for dates after Sat Sep 8 01:00:00 1951 JST).
    var_dump($timeOffset);
    ?>

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    User Contributed Notes 2 notes

    up
    0
    Anonymous
    2 years ago
    int offset does not cover fractional offsets of "rogue" locations such as Nepal etc.
    up
    -4
    Daniel Vidal
    2 years ago
    Note that the DateTime parameter has no effect in the result returned by DateTimeZone::getOffset($DateTime), unless, it refers to a DateTime where there is daylight savings in the referenced DateTimeZone.

    Ex.:
    <?php
    $timezone_brl     = new DateTimeZone('America/Sao_Paulo');
    $timezone_eng = new DateTimeZone('Europe/London');
    $timezone_aus = new DateTimeZone('Australia/Brisbane');

    $dateTimes = [
    new     DateTime()
    , new     DateTime('now', $timezone_eng)
    , new     DateTime('now', $timezone_aus)
    , new     DateTime('now', $timezone_brl)
    , new     DateTime('2000-06-10', $timezone_brl)
    , new     DateTime('2000-12-10', $timezone_brl)
    , new     DateTime('2020-12-10', $timezone_brl)
    ];

    foreach(    $dateTimes as $dateTime)
    {
    echo     "\n" . $timezone_brl->getOffset($dateTime);
    }
    /**
    * -10800
    * -10800
    * -10800
    * -10800
    * -10800 // No daylight savings in June/2000
    * - 7200 // Brazil had daylight savings until 2020
    * -10800 // No more daylight savings, so it returns -10800
    */

    ?>
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